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The Variation Characteristics of Extreme Precipitation Indices in Zunyi Area During 1960-2015
Zou Chengli,
Zou Dequan,
Wu Xingxing
Issue:
Volume 1, Issue 1, March 2019
Pages:
1-7
Received:
21 October 2018
Accepted:
12 December 2018
Published:
21 December 2018
Abstract: According to the temperature data of 13 weather stations at county (district or city) level under Zunyi City from 1960 to 2015, this study has calculated the extreme temperature indexes in Zunyi area. In addition, trend analysis, mutation test and Morlet wavelet function were used to analyze the extreme temperature index sequence and its periodic variation.The results show: (1) 10 indexes including average minimum temperature (TMINmean), minimum value of minimum temperature (TNn), warn night index (TN90P), tropical nights (TR20), maximum value of minimum temperature (TNX), minimum value of maximum temperature (TXn), maximum value of maximum temperature (TXX), average maximum temperature (TMAXmean), warn day index (TX90P), growing season length (GSL) etc in Zunyi area show a positive trend that decreases in turn.Among them, TMINmean, TNn, TN90P, TR20, TNX, TXn, TXX and TMAXmean reach above 0.05 of significance level, and all of them except TMAXmean experienced sudden increase in temperature between 1989 and 2009 that lasts till now, which means that obvious increase in extreme temperature still continues. The trend of TMINmean is greater than that of TMAXmean, signifying that high temperature weather caused by asymmetric change in temperature is intensifying.(2) 7 indexes including cold night index (TN10p), daily temperature range (DTR), frost day (FD0), cold spell duration indicator (CSDI), ice day (ID0), cold day index (TX10P) and warm spell duration indicator (WSDI) in Zunyi area show a negative trend that decreases in turn.Among them, TN10p, DTR, FD0 and CSDI reach above 0.05 of significance level, and all of them except CSDI experienced sudden change that lasts till now, which respectively shows that obvious range of increase in temperature at night, and asymmetric change in minimum temperature and maximum temperature increase, while frost weather decreases obviously.(3) The period of the strongest vibration of extreme temperature indexes in Zunyi area is between 4 and 32 years, and most of the first strong vibration occurred in the early 1960s.
Abstract: According to the temperature data of 13 weather stations at county (district or city) level under Zunyi City from 1960 to 2015, this study has calculated the extreme temperature indexes in Zunyi area. In addition, trend analysis, mutation test and Morlet wavelet function were used to analyze the extreme temperature index sequence and its periodic v...
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Advances in the Vegetataions’ Ecohydrology of Estuarine Wetland in China
Issue:
Volume 1, Issue 1, March 2019
Pages:
8-16
Received:
21 December 2018
Accepted:
13 February 2019
Published:
3 April 2019
Abstract: The natural environment of estuarine wetlands are located in marine-terrestrial and seawater-fresh water interlaced zone where vegetation is the primary productive force and the main builder of habitats for birds and spawning fish. In the late 1970s and early 1980s, a national wide survey of estuarine wetlands’ vegetation was conducted in China to identify the dominant phytocoenosium in each main estuary. Since the beginning of this century, with the in-depth study of the demand related to freshwater ecological, the research on the water-salt interaction of vegetation in estuarine wetland has developed rapidly. In this paper, we review the rule for three climate zones of China from north to south. In warm temperate zone of north China, the dominant community of estuarine supratidal zone is Phragmites Adans community. In the intertidal zone, the dominant community is Phragmites Adans community and Suaeda community. The law from inland to sea is as follows. When salinity of soil is between 5-6‰ and soil moisture content is about 20%, the dominant community is Calamagrostis community, Phragmites Adans community dominants when soil moisture content is more than 40%. When the salinity increased to 7-15‰ and the soil moisture content is about 40%, the dominant community is Suaeda community. Among which, there is an obvious Triarrhena Nakai. community transition zone between the soil water content of 20-40% in the Yellow River estuary wetland and when salinity is less than 10‰, there exists a transition zone of Tamarix Linn community, which is between the community of Phragmites Adans community and Suaeda community. In the subtropical monsoon region, the dominant community in the supra tidal zone is also Phragmites Adans community, which is same as the dominant community in warm temperate zone of north China. And the dominant community in the intertidal zone is Phragmites Adans-Spartina community. The law in this zone from estuary to ocean is that when salinity is less than 20‰ and average submerged depth is about 30cm, the dominant community is Phragmites Adans community. When salinity is 20-35‰ and the average submergence depth is 40cm, the dominant community is Phragmites Adans community or Spartina community. When salinity is 35-45‰ and the average submergence depth is 50cm, Scirpus Linn. community dominants or exists a shoal or bare ground. Mangrove plants are the dominant community of subtropical-tropical estuarine wetland. When salinity is between 0-5mg/g, the dominant community is Acanthus L community. As salinity increased to 7.5-21mg/g, the dominant community is Kandelia community. When salinity is between 11-15mg/g, the dominant community is Aegiceras Gaertn community. And when salinity is up to 8.8-17.5 mg/g, the dominant community is Avicennia L community.
Abstract: The natural environment of estuarine wetlands are located in marine-terrestrial and seawater-fresh water interlaced zone where vegetation is the primary productive force and the main builder of habitats for birds and spawning fish. In the late 1970s and early 1980s, a national wide survey of estuarine wetlands’ vegetation was conducted in China to ...
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The New Calculation Formula of CAPE and Energy Analyzing of “7.19” Heavy Rain in Xingtai
Li Rencheng,
Li Kaiyuan,
Lin Chaoxu,
Huo Ying
Issue:
Volume 1, Issue 1, March 2019
Pages:
17-37
Received:
29 December 2018
Accepted:
16 April 2019
Published:
13 May 2019
Abstract: The Convective Available Potential Energy(CAPE) is Important Parameter On Severe Convection Weather Forecast, CAPE Only is a Necessary Condition but Its not a Sufficient Condition. Maintenance and Development of Severe Convection Weather Its Related to the Accumulate and Evolution and Transport and Release of CAPE, Its Related to the Weather System with Exchange of Matter and Energy on External Environment. The New Calculation Formula for Embody of CAPE Come Into Used. The New Emagram (Energy-pet-unit-mass diagram) of Create Drawing. The Local Change Equation of CAPE be Presented. Make Energy an Analysis Analyzing to “7.19”Extraordinary Rainstorm in Xingtai. The “7.19” Extraordinary Rainstorm in Xingtai is a Severe Convection Weather Process on Under Combined Action of Small Scale Thunderstorm Monomers and Small Scale Thunderstorm Monomers and Mesoscale Convective System and Synoptic Low-pressure System and Low-level Nocturnal Jec and Upper Trough and Orographic Conditino etc.
Abstract: The Convective Available Potential Energy(CAPE) is Important Parameter On Severe Convection Weather Forecast, CAPE Only is a Necessary Condition but Its not a Sufficient Condition. Maintenance and Development of Severe Convection Weather Its Related to the Accumulate and Evolution and Transport and Release of CAPE, Its Related to the Weather System...
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Characteristics of Climate Variation in Three-River Headwaters Region During the Recent 60 Years
Chen Liang,
Liu Baokang,
Ling Zhiyong,
Lu Baoliang
Issue:
Volume 1, Issue 1, March 2019
Pages:
38-43
Received:
2 June 2019
Accepted:
10 July 2019
Published:
26 July 2019
Abstract: Temperature and precipitation have great influence on ecological system and social economy. Under the background of the global warming, concerning the regional characteristics of regional land use and land cover change, the climate change in Three-River Headwaters Region was analyzed. this Study was makeing use of Three-River Headwaters Region of 21 sites observation data, using the accumulative anomaly, the climate tendency rate and climate tendency coefficient method, Analyzing the study area in 1955-2014 years of climate change. The result indicates that the source area of the past 60 years the temperature rise significantly, average temperature 0.368°C/10 a higher amplitude, dry wet both season average temperature is on the rise, and the largest rise in the dry season, up to 0.382°C/10 a. Temperature rise there is significant regional differences, the biggest center is located in the eastern edge of warming, the temperature trend rate is greater than 0.6°C/10 a. Parts of precipitation increasing trend on the whole, less rainfall, annual precipitation tendency rate is 10.317 mm/10 a. Based on the climate mutation analysis, the results show that the temperature mutations appeared in 1971 and 1986, but the mutation is not obvious; Precipitation mutation appeared in 1970. The three-river source area of climate change to the source of national forest park ecological protection, animals and plants living environment improvement, etc. It is of great significance.
Abstract: Temperature and precipitation have great influence on ecological system and social economy. Under the background of the global warming, concerning the regional characteristics of regional land use and land cover change, the climate change in Three-River Headwaters Region was analyzed. this Study was makeing use of Three-River Headwaters Region of 2...
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